XML 63 R52.htm IDEA: XBRL DOCUMENT
v3.19.1

LOANS AND ALLOWANCE FOR LOAN LOSSES - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Receivables [Abstract] |  |  |
Increase in allowance for loan losses due to TDRs | $ 0 | $ 0 | $ 0
Troubled debt restructuring charge-offs |  | $ 0 | $ 0

X
- Definition Financing receivables, impaired, troubled debt restructuring, increase in allowance for loan losses. + References No definition available. + Details
Name: | gnty_FinancingReceivablesImpairedTroubledDebtRestructuringIncreaseInAllowanceForLoanLosses
Namespace Prefix: | gnty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration